android中如何使用九宫格可分页加载控件

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基本思路是viewpager+gridview,每一页viewpager视图有一个gridview,gridview加载九格。所以要保证数据的准确性。数据以List< List < T>>的形式。控件实现了高度自适应，根据控件的个数，计算控件的高度。内部的viewpager和gridview视图都以动态创建，无需新建一个xml文件，整个控件只需要一个item的布局文件。

使用方法

使用时可以先请求一个接口，需初始化数据，数据初始化需要根据总个数初始化所有数据，在每次分页加载的时候，再通过请求当页的数据，更改数据，刷新页面。

viewPager = findViewById(R.id.ninePages); //数据初始化 List> lists = new ArrayList<>(); for (int i = 0; i < 6; i++) {//页数 List list1 = new ArrayList<>(); for (int j = 0; j < 9; j++) {//每页个数 TestEntity entity = new TestEntity(); entity.setText("j=" + j + "/i=" + i); list1.add(entity); } lists.add(list1); } //设置不每页重复加载 viewPager.setEveryRequest(false); //设置分页加载 viewPager.setPagingLoad(true); viewPager.setListener(new RequestDataListener() { @Override public void request(int position) {//分页加载 List changeList =new ArrayList<>(); for (int i = 0; i < 9; i++) { TestEntity testEntity = new TestEntity(); testEntity.setText("change" + i); changeList.add(testEntity); } //数据刷新 viewPager.dataInvalidate(position,changeList); } @Override public int gridViewColumn() {//gridview列数 return 3; } @Override public View getView(LayoutInflater inflater, int position, View convertView, ViewGroup parent, List list) { ViewHolder viewHolder = null; if(convertView == null){ convertView = inflater.inflate(R.layout.item_gridview,parent,false); viewHolder = new ViewHolder(); viewHolder.textView = convertView.findViewById(R.id.textview); convertView.setTag(viewHolder); }else{ viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.textView.setText(list.get(position).getText()); return convertView; } }); viewPager.setList(lists);class ViewHolder{ private TextView textView; }

注意：viewPager.setList(lists);要在最后调用

视图控件：

public class NinePagesPagination extends LinearLayout { private View mView; private ViewPager viewPager; private Context context; private List> list = new ArrayList<>(); //已经请求过的，不在重复请求 private List hasAdded = new ArrayList<>(); //是否每次请求 private boolean isEveryRequest; //是否进行分页加载 private boolean isPagingLoad; private RequestDataListener listener; private MyViewPagerAdapter adapter; private ViewPager.OnPageChangeListener pageChangeListener; public NinePagesPagination(Context context, @Nullable AttributeSet attrs) { super(context, attrs); this.context = context; viewPager = new ViewPager(context); LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); viewPager.setLayoutParams(params); mView = viewPager; addView(mView); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if(listener!=null && listener.gridViewColumn() != 0){ int column = listener.gridViewColumn(); int row = (int) Math.ceil((double) list.get(0).size()/column); int heightMeasureSpec2 = MeasureSpec.makeMeasureSpec(row*getWidth()/column, MeasureSpec.AT_MOST); setMeasuredDimension(widthMeasureSpec,heightMeasureSpec2); } } public void setListener(RequestDataListener listener) { this.listener = listener; } public void setPageChangeListener(ViewPager.OnPageChangeListener pageChangeListener) { this.pageChangeListener = pageChangeListener; } public void setEveryRequest(boolean everyRequest) { isEveryRequest = everyRequest; } public void setPagingLoad(boolean pagingLoad) { isPagingLoad = pagingLoad; } public void setList(List> list) { this.list = list; initView(); invalidate(); } private void initView() { adapter = new MyViewPagerAdapter(context, list,listener); viewPager.setAdapter(adapter); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if(pageChangeListener != null){ pageChangeListener.onPageScrolled(position,positionOffset,positionOffsetPixels); } } @Override public void onPageSelected(int position) { if(pageChangeListener != null){ pageChangeListener.onPageSelected(position); } if (isPagingLoad) {//分页加载 if (isEveryRequest) {//每次都请求 adapter.setCurrentPosition(position); listener.request(position); } else {//请求过一次将不在重复请求 if (!hasAdded.contains(position)) { hasAdded.add(position); adapter.setCurrentPosition(position); listener.request(position); } } } } @Override public void onPageScrollStateChanged(int state) { if(pageChangeListener != null){ pageChangeListener.onPageScrollStateChanged(state); } } }); } //数据刷新 public void dataInvalidate(int position,List changeList){ list.set(position, changeList); adapter.notifyDataSetChanged(); }}

viewpager适配器：

public class MyViewPagerAdapter extends PagerAdapter { private Context context; private List> list; private LayoutInflater inflater; private MyGridViewAdapter adapter; private int currentPosition; private RequestDataListener listener; public MyViewPagerAdapter(Context context, List> list,RequestDataListener listener) { this.context = context; this.list = list; this.listener = listener; inflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size(); } @Override public boolean isViewFromObject(@NonNull View view, @NonNull Object object) { return view == object; } @NonNull @Override public Object instantiateItem(@NonNull ViewGroup container, int position) { GridView view = new GridView(context); ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); view.setLayoutParams(params); view.setTag(position); if(listener!=null && listener.gridViewColumn() != 0){ view.setNumColumns(listener.gridViewColumn()); } adapter = new MyGridViewAdapter(context, list.get(position),listener); view.setAdapter(adapter); container.addView(view); return view; } @Override public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) { container.removeView((View) object); } @Override public int getItemPosition(@NonNull Object object) { //viewpager立即刷新页面 if (list != null && list.size() == 0) { return POSITION_NONE; } View view = (View) object; if (currentPosition == (Integer) view.getTag()) { return POSITION_NONE; } else { return POSITION_UNCHANGED; } } @Override public void notifyDataSetChanged() { super.notifyDataSetChanged(); if(adapter != null){ adapter.notifyDataSetChanged(); } } public void setCurrentPosition(int currentPosition) { this.currentPosition = currentPosition; }}

gridview适配器

public class MyGridViewAdapter extends BaseAdapter{ private Context context; private List list; private LayoutInflater inflater; private RequestDataListener listener; public MyGridViewAdapter(Context context, List list,RequestDataListener listener){ this.context = context; this.list = list; this.listener = listener; inflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { convertView = listener.getView(inflater,position,convertView,parent,list); int width; //计算item的宽 if(listener != null &listener.gridViewColumn() != 0){ width = parent.getWidth()/listener.gridViewColumn(); }else{ width = parent.getWidth()/3; } //设置item的宽高相等 convertView.setLayoutParams(new AbsListView.LayoutParams(width,width)); return convertView; }}

暴露的接口

public interface RequestDataListener { void request(int position); //gridView列数 int gridViewColumn(); View getView(LayoutInflater inflater, int position, View convertView, ViewGroup parent, List list);}

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